CN111268796A - System and method for treating low C/N ratio domestic sewage by anaerobic/anoxic filler and staged water inlet three-stage AO - Google Patents
System and method for treating low C/N ratio domestic sewage by anaerobic/anoxic filler and staged water inlet three-stage AO Download PDFInfo
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- CN111268796A CN111268796A CN201911301379.9A CN201911301379A CN111268796A CN 111268796 A CN111268796 A CN 111268796A CN 201911301379 A CN201911301379 A CN 201911301379A CN 111268796 A CN111268796 A CN 111268796A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
Abstract
The invention discloses a process system for treating low C/N ratio domestic sewage by using anaerobic/anoxic filler reinforced staged water inlet three-stage AO. The sewage in the anaerobic tank and the secondary anoxic zone comes from sewage and treatment facilities. Each stage of aeration pipe of the first-stage aerobic zone, the second-stage aerobic zone and the third-stage aerobic zone is connected with a main aeration pipe, the tail ends of the aerobic zones are respectively provided with a dissolved oxygen concentration measuring probe, the secondary sedimentation tank is provided with a sewage flow outlet and a sludge outlet, and the sludge outlet is connected with a sludge injection port at the front end of the anaerobic tank. The tail end of the third-stage aerobic tank is provided with sludge which flows back to the front end of the first-stage anoxic tank. The three-stage AO system has stronger denitrification capability, is combined with anaerobic/anoxic fillers, improves the TN degradation capability of the system, and is suitable for the treatment of sewage with low C/N ratio.
Description
Technical Field
The invention belongs to the field of sewage treatment, relates to a sewage treatment process, and particularly relates to a process system for treating low-C/N-ratio domestic sewage by using anaerobic/anoxic filler reinforced segmented water inlet three-stage AO.
Background
With the improvement of the national effluent standard requirement, the C/N ratio of the water coming from the municipal sewage treatment plant (station) is lower, the total nitrogen removal effect of most of the sewage treatment plants (stations) is not ideal, and the national continuously puts forward a strict requirement on the total nitrogen emission standard in recent years, thereby defining the total nitrogen emission requirement. The prior municipal sewage treatment plant (station) mainly adopts the processes of AAO, SBR or oxidation ditch, etc. Although the processes have good effects on removing organic matters and ammonia nitrogen, the treatment effect of total nitrogen needs to be improved by technical transformation to meet the increasingly strict requirement on total nitrogen emission.
In sewage plants (stations) in China at present, although AO and some new processes developed on the basis of AO can obtain better denitrification effect, the defects of low value-added speed and concentration of nitrobacteria, weak impact load resistance and the like still exist.
The sewage denitrification technology can be divided into a biochemical method and a physicochemical method. The physical and chemical methods include a physical and chemical stripping method, a chemical precipitation method, an ion exchange method, electrodialysis and the like, but the physical and chemical methods do not include the processes of converting organic nitrogen into ammonia nitrogen and oxidizing the ammonia nitrogen into nitrate nitrogen, and generally only can remove the ammonia nitrogen, and meanwhile, the physical and chemical methods generally have the problems of complex process, high operation cost and small application range, so that the physical and chemical methods are difficult to popularize and apply in large-scale municipal sewage treatment. Therefore, biological denitrification is increasingly favored in sewage treatment. In the biological denitrification system, not only can organic matters be removed, but also organic nitrogen and ammonia nitrogen in the sewage can be converted into nitrogen through biological nitrification and denitrification, and finally removed from the sewage, and the biological denitrification system has the advantages of good denitrification effect, no secondary pollution, low energy consumption and cost and the like. At present, the sewage treatment denitrification process which is applied more comprises an AO pre-denitrification process, an oxidation ditch process, an SBR and deformation process, an MBR process and the like, but is limited by a reflux ratio, a C/N ratio, a microbial flora and the like, and the process has lower removal efficiency (70-80%) on the total nitrogen of the sewage with the low C/N ratio, so that the ideal harmless treatment effect is not achieved.
Disclosure of Invention
The invention aims to solve the problems of the prior art and provides a process system for treating low C/N ratio domestic sewage by using anaerobic/anoxic filler reinforced segmented water inlet three-stage AO. The step-feed process improves the utilization effect of the carbon source of the feed water, increases the treatment effect of the total nitrogen, can save the addition of the carbon source or part of the addition of the carbon source, and reduces the operation cost so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a process system for treating low C/N ratio domestic sewage by anaerobic/anoxic filler reinforced staged water inlet three-stage AO is characterized in that a three-stage AO biological reaction tank is formed by an anaerobic tank, a first-stage anoxic zone, a first-stage aerobic zone, a second-stage anoxic zone, a second-stage aerobic zone, a third-stage anoxic zone and a third-stage aerobic zone which are sequentially communicated; the sewage injection ports of the anaerobic tank and the secondary anoxic zone are respectively connected with a sewage main pipe through pumps. Each grade of aeration pipe in one-level aerobic zone, second grade aerobic zone, tertiary aerobic zone all connects main aeration pipe, is provided with independent valve on the main aeration pipe in each grade of independent aerobic zone for the independent control aeration rate. The tail ends of the first-stage aerobic zone, the second-stage aerobic zone and the third-stage aerobic zone are respectively provided with a dissolved oxygen concentration measuring probe, the secondary sedimentation tank is provided with a sewage flow outlet and a sludge outlet, and the sludge outlet is connected with a sludge injection port at the front end of the anaerobic tank. The tail end of the third-stage aerobic tank is provided with sludge which flows back to the front end of the first-stage anoxic tank. Anaerobic fillers are added into the anaerobic tank and the first-stage anoxic tank.
Furthermore, raw water is pumped into the system by a pump through a sewage adjusting barrel, and all water flows in the system are baffled.
Further, sewage enters the biochemical reaction tank at two points, and carbon sources in the sewage are fully utilized, so that high-efficient and utilizable high-quality carbon sources are provided for denitrification of each stage.
Furthermore, the first-stage aerobic zone, the second-stage aerobic zone and the third-stage aerobic zone are connected to a main aeration pipeline by aeration pumps, and each aeration pipeline is provided with an independent valve for controlling aeration quantity. The concentration range of the dissolved oxygen in the first-stage aerobic zone is 1.0-2.0mg/L, the concentration range of the dissolved oxygen in the second-stage aerobic zone is 1.5-3.0mg/L, and the concentration range of the dissolved oxygen in the third-stage aerobic zone is 1.0-2.0 mg/L.
Furthermore, stirrers are respectively arranged in the anaerobic zone, the first-stage anoxic zone, the second-stage anoxic zone and the third-stage anoxic zone, and the stirring rotating speed of each stirrer is the same.
Furthermore, a filter screen is arranged at a water outlet of the first-stage anoxic zone to intercept the filler, so that the filler is prevented from entering a lower-stage processing unit.
Furthermore, a micro aeration device is arranged at the bottom of the intercepting filter screen to prevent the filler from blocking the filter screen and overflowing.
The method for treating the domestic sewage with the low C/N ratio by using the anaerobic filler and the segmented water inlet three-stage AO comprises the following steps:
s1, firstly adding anaerobic filler with the volume of 40-60% of the volume of the anaerobic tank and the first-stage anoxic tank body;
s2, continuously feeding water into the anaerobic tank and the primary anoxic tank to finish film formation of the anaerobic filler;
s3, taking a water sample at regular time for detection, and completing the construction of an activated sludge system after the nitrification is started;
s4, controlling part of inlet water and sludge which flows back from the secondary sedimentation tank through a sludge return pipeline by adjusting a water inlet pump to respectively enter an anaerobic tank for stirring and mixing, and enabling the rest of inlet water to enter a secondary anoxic tank, and completing denitrification and nitration reactions of sewage through a tertiary AO reaction tank;
s5, the effluent after the reaction in the aerobic tank flows to a secondary sedimentation tank automatically to complete mud-water separation, the effluent reaches the standard and is discharged outside or enters a subsequent treatment unit, a water sample is taken regularly during the period for detection, and the water inflow is gradually increased until the designed water amount according to the actual treatment effect;
and S6, after the water inflow reaches the designed water amount, according to engineering practice experience and actual treatment effect, carrying out optimization of the whole operation by adjusting parameters such as inflow distribution, sludge reflux ratio, sludge age and dissolved oxygen.
S7 adding anaerobic filler into the anaerobic tank and the first-stage anoxic tank, wherein the filling rate of the anaerobic filler is 40-60%, under the stirring action, the anaerobic filler is uniformly distributed in the tank in a suspension state, so that a biological membrane is uniformly implanted, and the biomass in unit volume of the tank is higher than that of the activated sludge biochemical tank, therefore, the tank has higher volume load, strong impact load resistance and higher denitrification effect than that of a tank body without the anaerobic filler.
The reflux ratio of the sludge is 100-200%, and the reflux ratio of the internal reflux mixed liquor is 100-150%.
The filler is suspended in the anaerobic tank and the first-stage anoxic tank, the filler is light anaerobic filler and soft or hard, and the filling rate of the filler is 40-60%.
Compared with the prior art, the invention has the beneficial effects that:
1. the method utilizes the characteristics of three-stage AO and anaerobic filler, adopts a graded denitrification mode, saves energy consumption and can obtain higher denitrification rate, namely denitrification efficiency.
2. The method improves the average sludge concentration of the system: because sewage enters the anoxic tank in a segmented manner, the dilution of returned sludge is delayed, a sludge concentration gradient is formed in space, the sludge concentration at the front section is higher, high sludge concentration and low substrate concentration can be formed in a local space, the sludge load is reduced, the total volume of the tank body is reduced, and the investment is saved.
Drawings
FIG. 1 is a schematic diagram of a process system for anaerobic/anoxic filler reinforced staged influent three-stage AO treatment of low C/N ratio domestic sewage according to the present invention.
In the figure:
1: and (3) anaerobic tank 2: a first-stage anoxic tank 3: a primary aerobic tank 4: second grade oxygen deficiency pond
5: a secondary aerobic tank 6: a third-stage anoxic tank 7: a third-stage aerobic tank 8: connecting pipe
9: a secondary sedimentation tank 10: a sewage outflow port 11: sludge discharge port 12: sludge return pipe
13: inner return pipe 14: air manifold
151: the aeration regulating valve 152 of the first-stage aerobic tank: aeration regulating valve of secondary aerobic tank
153: the aeration regulating valve 16 of the secondary aerobic tank: sewage main pipe
171: anaerobic tank intake pump 172: secondary anoxic tank water inlet pump
18: anaerobic filler 19: third stage AO reaction cell 20: dissolved oxygen probe
21: filler screen 22: micro-aeration device
Detailed Description
The process realizes the purpose of denitrification of sewage with low C/N ratio, and has the following specific modes:
as shown in figure 1, the anaerobic/anoxic filler reinforced staged water inlet three-stage AO domestic sewage treatment process system with low C/N ratio comprises a three-stage AO biological reaction tank 19 and a secondary sedimentation tank 9 connected with the sewage outflow end of the three-stage AO biological reaction tank 19 through a connecting pipe 8; the three-stage AO biological reaction tank 19 comprises an anaerobic tank 1, a first-stage anoxic tank 2, a first-stage aerobic tank 3, a second-stage anoxic tank 4, a second-stage aerobic tank 5, a third-stage anoxic tank 6 and a third-stage aerobic tank 7 which are sequentially communicated. The three-level water inlet point adopts different flow distribution strategies according to different treatment requirements, namely the anaerobic tank 1 is connected with the sewage pipe 16 through an anaerobic tank water inlet pump 171, the second-level anoxic tank 4 is connected with the sewage pipe 16 through a second-level anoxic tank water inlet pump 172, and the anaerobic tank water inlet pump 171 and the second-level anoxic tank water inlet pump 172 are adjusted in real time according to needs to achieve flow distribution proportion.
Each level of aeration pipeline of the first-level aerobic tank 3, the second-level aerobic tank 5 and the third-level aerobic tank 7 is respectively connected with the air main pipe 14 through a first-level aerobic tank aeration regulating valve 151, a second-level aerobic tank aeration regulating valve 152 and a third-level aerobic tank aeration regulating valve 153; the dissolved oxygen solubility of the first-stage aerobic tank 3, the second-stage aerobic tank 5 and the third-stage aerobic tank 7 can be independently controlled.
The tail ends of the first-stage aerobic tank 3, the second-stage aerobic tank 5 and the third-stage aerobic tank 7 are respectively provided with a dissolved oxygen concentration measuring probe 20.
And aeration oxygenating devices are respectively arranged in the first-stage aerobic tank 3, the second-stage aerobic tank 5 and the third-stage aerobic tank 7.
The anaerobic tank 1, the first-stage anoxic tank 2, the second-stage anoxic tank 4 and the third-stage anoxic tank 6 are respectively provided with a stirring device.
The secondary sedimentation tank 9 is respectively provided with a sewage flow outlet 10 and a sludge discharge outlet 11, and the sludge discharge outlet 11 is connected with a sludge injection port of the anaerobic tank 1 through a sludge return pipe 12. The sludge outlet 11 of the secondary sedimentation tank 9 is provided with a sludge injection port for conveying the sludge in the secondary sedimentation tank 9 to the front end of the anaerobic tank 1 through a sludge return pipe 12.
The sludge return flow of the secondary sedimentation tank 9 is set to be 100-200%.
The invention relates to a process system for treating low C/N ratio domestic sewage by using an anaerobic/anoxic filler reinforced staged water inlet three-stage AO, which divides the sewage into two parts and enters an anaerobic tank 1 and a second-stage anoxic zone 4 of a three-stage AO biological reaction tank in stages according to different proportions, simultaneously, return sludge provided by a secondary sedimentation tank 9 enters from the front end of the anaerobic tank 1 and is mixed with the sewage, and available carbon sources in the sewage are utilized to provide nutrition for denitrifying bacteria as much as possible, so that the growth of the denitrifying bacteria is accelerated, and the denitrification efficiency is obviously improved.
The system combines a three-stage AO process concept with anaerobic packing, wherein the three-stage AO refers to a series process of 3 AO, a first-stage anaerobic tank is arranged at the forefront end, sewage respectively enters the anaerobic tank and a second-stage anoxic tank according to a certain proportion to provide a denitrification carbon source for nitrate generated in a first-stage aerobic tank, and a last-stage aerobic tank is connected with a secondary sedimentation tank. A reflux pump is arranged in the secondary sedimentation tank to reflux the sludge to the front end of the anaerobic tank, and the reflux amount is 100-200%. The characteristics of three-stage AO and anaerobic filler are utilized, and a graded denitrification mode is adopted, so that the TN treatment effect is ensured.
As the TN treatment capacity is improved, the carbon source can be saved or part of the carbon source can be saved for the sewage with low C/N ratio, and the operation cost is correspondingly saved.
Claims (10)
1. A process system for treating low C/N ratio domestic sewage by anaerobic/anoxic filler reinforced staged water inlet three-stage AO is characterized in that a three-stage AO biological reaction tank is formed by an anaerobic tank, a first-stage anoxic tank, a first-stage aerobic zone, a second-stage anoxic zone, a second-stage aerobic zone, a third-stage anoxic zone and a third-stage aerobic zone which are sequentially communicated; the sewage inlets of the anaerobic tank and the secondary anoxic zone are respectively connected with a sewage main pipe through pumps; each stage of aeration pipeline of the first-stage aerobic zone, the second-stage aerobic zone and the third-stage aerobic zone is respectively connected with a main aeration pipe through a rubber hose, and an independent valve is arranged on the main aeration pipe of each stage of independent aerobic zone and used for independently controlling aeration quantity; the tail ends of the first-stage aerobic zone, the second-stage aerobic zone and the third-stage aerobic zone are respectively provided with a dissolved oxygen concentration measuring probe, the secondary sedimentation tank is provided with a sewage flow outlet and a sludge outlet, and the sludge outlet is connected with a sludge injection port at the front end of the anaerobic tank; the tail end of the third-stage aerobic tank is provided with sludge which flows back to the front end of the first-stage anoxic tank; anaerobic fillers are added into the anaerobic tank and the first-stage anoxic tank.
2. The anaerobic/anoxic filler reinforced staged influent three-stage AO treatment low C/N ratio domestic sewage process system as claimed in claim 1, wherein raw water is pumped into the system through a sewage conditioning tank by a pump, and all water flows in the system are baffled.
3. The process system for treating the domestic sewage with the low C/N ratio by using the anaerobic/anoxic filler reinforced staged water inlet three-stage AO as claimed in claim 1, wherein the sewage enters the biochemical reaction tank at two points, and carbon sources in the sewage are fully utilized to provide carbon sources for denitrification at each stage.
4. The anaerobic/anoxic filler reinforced staged influent three-stage AO treatment low C/N ratio domestic sewage process system as claimed in claim 1, wherein the primary aerobic zone, the secondary aerobic zone and the tertiary aerobic zone are connected to a total aeration pipeline by aeration pumps, each aeration pipeline has an independent valve to control aeration amount; the concentration range of the dissolved oxygen in the first-stage aerobic zone is 1.0-2.0mg/L, the concentration range of the dissolved oxygen in the second-stage aerobic zone is 1.5-3.0mg/L, and the concentration range of the dissolved oxygen in the third-stage aerobic zone is 1.0-2.0 mg/L.
5. The anaerobic/anoxic filler reinforced staged influent three-stage AO treatment low C/N ratio domestic sewage process system according to claim 1, wherein stirrers are respectively arranged in the anaerobic tank, the primary anoxic tank, the secondary anoxic zone and the third anoxic zone, and the stirring rotation speed of each stirrer is the same.
6. The anaerobic/anoxic filler reinforced staged influent three-stage AO treatment low C/N ratio domestic sewage process system according to claim 1, wherein a filter screen is provided at a water outlet of the first-stage anoxic tank to intercept the filler and prevent the filler from entering a next-stage treatment unit.
7. The anaerobic/anoxic filler reinforced staged influent three-stage AO treatment low C/N ratio domestic sewage process system according to claim 1, wherein a micro aeration device is provided at the bottom of the intercepting screen to prevent the filler from blocking the screen and overflowing.
8. The method for treating the low C/N ratio domestic sewage by using the anaerobic packing and the segmented water inlet three-stage AO in the system of claim 1 is characterized in that: comprises the following steps of (a) carrying out,
s1, firstly adding anaerobic filler with the volume of 40-60% of the volume of the anaerobic tank and the first-stage anoxic tank body;
s2, continuously feeding water into the anaerobic tank and the primary anoxic tank to finish film formation of the anaerobic filler;
s3, taking a water sample at regular time for detection, and completing the construction of an activated sludge system after the nitrification is started;
s4, controlling part of inlet water and sludge which flows back from the secondary sedimentation tank through a sludge return pipeline by adjusting a water inlet pump to respectively enter an anaerobic tank for stirring and mixing, and enabling the rest of inlet water to enter a secondary anoxic tank, and completing denitrification and nitration reactions of sewage through a tertiary AO reaction tank;
s5, the effluent after the reaction in the aerobic tank flows to a secondary sedimentation tank automatically to complete mud-water separation, the effluent reaches the standard and is discharged outside or enters a subsequent treatment unit, a water sample is taken regularly during the period for detection, and the water inflow is gradually increased until the designed water amount according to the actual treatment effect;
and S6, after the water inflow reaches the designed water amount, carrying out integral operation optimization by adjusting the inflow distribution, the sludge reflux ratio, the sludge age and the dissolved oxygen parameters according to engineering practice experience and actual treatment effect.
S7 adding anaerobic filler in the anaerobic tank and the first-stage anoxic tank, wherein the filling rate of the anaerobic filler is 40-60%, the anaerobic filler is uniformly distributed in the tank in a suspension state under the stirring effect, so that the biological membrane is uniformly implanted, and the biomass in unit volume of the tank is higher than that of the biochemical tank by the activated sludge process.
9. The method for treating low C/N ratio domestic sewage by using the anaerobic packing and the staged water inlet three-stage AO as claimed in claim 9, wherein: the reflux ratio of the sludge is 100-200%, and the reflux ratio of the internal reflux mixed liquor is 100-150%.
10. The method for treating low C/N ratio domestic sewage by using the anaerobic packing and the staged water inlet three-stage AO as claimed in claim 9, wherein: the filler is suspended in the anaerobic tank and the first-stage anoxic tank, the filler is light anaerobic filler and soft or hard, and the filling rate of the filler is 40-60%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233593A (en) * | 2021-05-08 | 2021-08-10 | 中国市政工程中南设计研究总院有限公司 | Sewage treatment process and sewage treatment device |
| CN113860633A (en) * | 2021-09-14 | 2021-12-31 | 华设设计集团股份有限公司 | Integrated sewage treatment device and method for expressway service area |
| CN114163070A (en) * | 2021-11-18 | 2022-03-11 | 南方创业（天津）科技发展有限公司 | Multi-stage AO + MBBR integrated and modular sewage treatment device and treatment process thereof |
| CN116903139A (en) * | 2023-08-24 | 2023-10-20 | 宇星环保工程有限公司 | Multistage water inlet multistage AO system suitable for sewage treatment plant reconstruction and control method |
-
2019
- 2019-12-17 CN CN201911301379.9A patent/CN111268796A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233593A (en) * | 2021-05-08 | 2021-08-10 | 中国市政工程中南设计研究总院有限公司 | Sewage treatment process and sewage treatment device |
| CN113860633A (en) * | 2021-09-14 | 2021-12-31 | 华设设计集团股份有限公司 | Integrated sewage treatment device and method for expressway service area |
| CN114163070A (en) * | 2021-11-18 | 2022-03-11 | 南方创业（天津）科技发展有限公司 | Multi-stage AO + MBBR integrated and modular sewage treatment device and treatment process thereof |
| CN116903139A (en) * | 2023-08-24 | 2023-10-20 | 宇星环保工程有限公司 | Multistage water inlet multistage AO system suitable for sewage treatment plant reconstruction and control method |
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